How do I write a .Net Regular Expression to match from the end of line back

I have the following line of text

Reference=*\G{7B35DDAC-FFE2-4435-8A15-CF5C70F23459}#1.0#0#..\..\..\bin\App Components\AcmeFormEngine.dll#ACME Form Engine

and wish to grab the following as two separate capture groups:

AcmeFormEngine.dll
ACME Form Engine

Can anyone help?

From stackoverflow

•     using System.Text.RegularExpressions;
  
      Regex regex = new Regex(
      @"\\(?<filename>[\w\.]+)\#(?<comment>[\w ]+)$",
      RegexOptions.IgnoreCase
      | RegexOptions.Compiled
      );
  

  Matthew Scharley : Does the hash really need escaping? What special meaning does it have?

  Bartek Szabat : Hash is begin of comment

  Gishu : # seems to stand for comment :) I think

  Matthew Scharley : Silly .NET regexes. Fixed mine now.

  Gishu : this is broken if you have - or _ in the filename

• Regex r = new Regex("\\(.+?)\#(.+?)$");
  

  Non-greedy multiplicities are great.

  '$': Match the end of the string.

  "\#(.+?)": Match everything back from the end of the string till the first '#' character and return that in a capture.

  "\\(.+?)": Same again, except with an escaped '\'.

  Gishu : this doesn't work. '\.' is a valid match

  Matthew Scharley : Should be fixed now. silly # comments.

  Joel Coehoorn : upvote because it's the shorted expression and you explained how/why it works

• If you are sincere of the string format, you can also solve that in an earthbound manner, without regex: Take everything after the last index of '\', and split that at '#'.

  Gishu : agree. More readable over a regex in this specific scenario.

  tvanfosson : And more efficient since we only need to do character comparison and avoid the overhead of the state machine.

• I voted for tomalask's non-regex approach. However if you HAD to do it with regex, I think you need something like this

  \\([^\\/?"<>|]+?)\#([^\\/?"<>|]+?)[\r\n]*$
  

  This will allow things like - and _ which are valid in filenames, Its 2 identical groups (each excluding invalid chars for win32 filenames) beginning with a slash, delimited by a # and at the end of the line (the $). Assuming second group is also a valid win32 filename.. I saw some ugly boxes in the matched second group, the [\r\n]* keeps them away.

  e.g. F5C70F23459}#1.0#0#..\..\..\bin\App Components\Acme_Form-Engine.dll#ACME Form Engine
  group#1 => Acme_Form-Engine.dll
  group#2 => ACME Form Engine
  

  In short this is arcane.. avoid if possible.